Celestin-blue sulfonic acid.



sulfuric acid with a blue color.

UNITED STATES Parana OFFICE.

WILHELM LOMMEL, OF ELBERFELD, GERMANY, ASSIGN OR TO FARBENFABRIKEN VORA; FRIEDR. BAYER & 00., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

CELEBTIN-BLUE SULFONIG ACID.

Specification of Letters Patent.

Patented Oct. 27, 1908.

To all whom it ma concern:

Be it known hat I, W'ILHELM LoMMEL, doctor of philosophy, chemist, citizen of the German Empire, residing at Elberfeld, Germany, Kingdom of Prussia, have invented new and useful Improvements in Celestin- Blue Sulfonic Acid, of which the following is a specification.

p 11 United States Letters Patent 663221 dated December 4, 1900 it is stated that gallocyanins obtained byconde-nsing nitrosodialkylanilins with galhc acid, ethereal gallates or gallamic acid cannot be sulfonated by the usual means, such as sulfuric acid anhydrid and the like.

I have found that celestin blue (prepared by treating gallamic acid with nitrosodiethvlanilin) can easily be converted into its sulfonic acid by treating it with chlorosulfonic acid 1 The new free sulfonic acid having most probably the formula: C H N O,.SO H is a dark powder soluble in water and soluble in It is soluble in dilute hydrochloric acid with a red color and soluble in acetic acid with a pure blue color. I

In order to illustrate the new process more fully the following example is given, the

arts being by weight. 25 parts of celestin iilue are introduced into 100 parts of chlorosulfonic acid during stirring and cooling.

' blue shades.

Havi'ng now described my invention and in what manner the same is to be performed what I claim as new and desire to secure by Letters Patent is:-

The herein-described new sulfonic acid of eelestin blue of the probable formula:

C H N O SOJI, which is in the free state a dark powder iwhich dissolves in water and in sulfuric acid with a blue color; dissolves in dilute hydrochloric acid with a red color and dissolves in acetic acid with a pure blue color; and produces when printed with chromium com ounds on cotton pure blue shades, substantia ly as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILHELM LoMMEL. Witnesses:

AUGUST HELLER, WM. WAsmnc'roN BRUNSWICK. 

